関連ワード:  why is it difficult to learn a new language    why is it hard to learn a new language as an adult    why is it hard to learn a second language    why is it so difficult to learn a new language in adulthood psychology    why is it so difficult to learn a new language in adulthood    why is it hard to learn another language    why is it important to learn a foreign language    why is it harder for adults to learn a new language    why is it hard for me to learn a new language    is it easy to learn a foreign language  
結果 : why is it difficult to learn a foreign language